linux-kernel - Re: [PATCH v30 02/12] landlock: Add ruleset and domain management

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Message-ID: <202103191213.D6B1B27423@keescook>
Date:   Fri, 19 Mar 2021 12:15:36 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Mickaël Salaün <mic@...ikod.net>
Cc:     James Morris <jmorris@...ei.org>, Jann Horn <jannh@...gle.com>,
        "Serge E . Hallyn" <serge@...lyn.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Arnd Bergmann <arnd@...db.de>,
        Casey Schaufler <casey@...aufler-ca.com>,
        David Howells <dhowells@...hat.com>,
        Jeff Dike <jdike@...toit.com>,
        Jonathan Corbet <corbet@....net>,
        Michael Kerrisk <mtk.manpages@...il.com>,
        Richard Weinberger <richard@....at>,
        Shuah Khan <shuah@...nel.org>,
        Vincent Dagonneau <vincent.dagonneau@....gouv.fr>,
        kernel-hardening@...ts.openwall.com, linux-api@...r.kernel.org,
        linux-arch@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        linux-security-module@...r.kernel.org, x86@...nel.org,
        Mickaël Salaün <mic@...ux.microsoft.com>
Subject: Re: [PATCH v30 02/12] landlock: Add ruleset and domain management

On Fri, Mar 19, 2021 at 08:03:22PM +0100, Mickaël Salaün wrote:
> On 19/03/2021 19:40, Kees Cook wrote:
> > On Tue, Mar 16, 2021 at 09:42:42PM +0100, Mickaël Salaün wrote:
> >> [...]
> >> +static void put_rule(struct landlock_rule *const rule)
> >> +{
> >> +	might_sleep();
> >> +	if (!rule)
> >> +		return;
> >> +	landlock_put_object(rule->object);
> >> +	kfree(rule);
> >> +}
> > 
> > I'd expect this to be named "release" rather than "put" since it doesn't
> > do any lifetime reference counting.
> 
> It does decrement rule->object->usage .

Well, landlock_put_object() decrements rule->object's lifetime. It seems
"rule" doesn't have a lifetime. (There is no refcounter on rule.) I just
find it strange to see "put" without a matching "get". Not a big deal.

-- 
Kees Cook